Telstra Tower (also known as Black Mountain Tower and formerly Telecom Tower) is a telecommunications tower and lookout that is situated above the summit of Black Mountain in Australia's capital city of Canberra. It is named after Australia's largest telecommunications company, Telstra Corporation. Rising 195.2 metres (640 ft) above the mountain summit, it is a landmark in Canberra and offers panoramic views of the city and its surrounding countryside from an indoor observation deck and two outdoor viewing platforms.

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In April 1970, the Postmaster General (PMG) at the time commissioned the Commonwealth Department of Housing and Construction to carry out a feasibility study in relation to a tower on Black Mountain accommodating both communication services and facilities for visitors. The tower was to replace the microwave relay station on Red Hill and the television broadcast masts already on Black Mountain.[1]

During the approval process of the tower, protests arose on aesthetic and ecological grounds. Some people felt that the tower would dominate other aesthetic Canberra structures due to its location above Black Mountain and within a nature reserve. A case was brought before the High Court of Australia arguing that the Federal Government did not have the constitutional power to construct the tower (Johnson v Kent (1975) 132 CLR 164). The decision was made in favour of the government and construction was able to commence.[1]

William Roy, at the time in charge of Canberra ABC radio and television transmitters, was employed to supervise the installation of technical equipment in the Tower and became its first Principal Technical Officer.

Prior to the construction of the tower, CTC-TV (now called Southern Cross Ten Canberra) had its studios located at the top of Black Mountain. Also located on the top were two guy-wired masts, one for CTC-TV and the other one for the local ABC TV station. These were demolished in 1980 after the tower had opened.

Telstra Tower provides important communication facilities for Canberra along with both indoor and outdoor observation decks, a café and a gift shop. There are three floors of business, sales and radio communication facilities located between the 30.5 metre and 42.7 metre levels providing space for communication dishes, platforms and equipment for mobile services within the tower.

The viewing platforms provide 360 degree views of Canberra and the surrounding city and countryside. Visitors to Telstra Tower can see the city unfold from the enclosed viewing gallery or from the two open viewing platforms. Besides the telecommunications facilities the tower includes also a souvenir shop, a relaxing coffee lounge.

Former facilities included Canberra's only revolving restaurant which rotated 360 degrees in 81 minutes which allowing diners to experience a changing view throughout their meal. In the lower level of the Tower's entrance foyer, there was formerly an exhibition "Making Connections" which traced the history of Australian telecommunications from the earliest days into the 21st century but this has since been removed. There is a theatre which provides a video, produced shortly after the tower opened, on the tower's design and construction.

Telstra Tower has become one of the most symbolic landmarks in Canberra and a major tourist attraction with a total of over six million visitors. In 1989 the World Federation of Great Towers invited the tower to join such distinguished monuments as the CN Tower in Toronto, Blackpool Tower in England and the Empire State Building in New York City.

Telstra Tower is one of the most visually imposing structures on the Canberra skyline, visible from many parts of Canberra and Queanbeyan.